Operation Pokpoong (폭풍작전; Korean for Storm) was an offensive operation of the Democratic People's Republic of Korea (DPRK) against the Republic of Korea (ROK) that marked the start of the Korean War. The operation began at 04:00 KST on 25 June 1950 along the 38th parallel north without a declaration of war. The operation was planned by the DPRK and the Union of Soviet Socialist Republics (USSR) with the USSR supplying weapons such as tanks and aircraft to its ally. The DPRK was able to take control of the southern capital Seoul within a few days.